Involves averaging arithmetic and integral partial functions over sparse set

Let $p$ be a prime number, $k\ge 0$ and $f$ be a class of arithmetic functions satisfying some simple conditions. In this short paper, we study the asymptotical behaviour of summation function $${\psi }_{f,k}(x):=\sum _{n\le x}\mathrm{\Lambda }(n)\frac{f\left(\left[\frac{x}{n}\right]\right)}{{\left[\frac{x}{n}\right]}^k},{\pi }_{f,k}(x):=\sum _{p\le x}\frac{f\left(\left[\frac{x}{p}\right]\right)}{{\left[\frac{x}{p}\right]}^k}$$ as $x\to \mathrm{\infty }$, where $[\cdot ]$ is the integral part function, $\mathrm{\Lambda }(n)$ is the von Mangoldt function.